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You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / Allometry of external morphology and sexual dimorphism in the red porgy (Pagrus pagrus)

George Minos, Lambros Kokokiris and Maroudio Kentouri (2008)

Allometry of external morphology and sexual dimorphism in the red porgy (Pagrus pagrus)

BELGIAN JOURNAL OF ZOOLOGY, 138(1):90-94.

Body weight (W), nine morphometric variables and total length (TL) were estimated for each sex in the protogynous red porgy, (Pagrus pagrus) reared in captivity. The power function Y=aX(b) was used to evaluate growth-related changes in morphology. The first derivative, dY/dTL=abTL(b-1), where Y is each morphometric character, was used to study the growth pattern of each character relative to growth in length (TL). The length-weight relationship showed isometric growth and no inter-sex variability. The analysis of the morphometric variables demonstrated the existence of a substantial degree of differences between the sexes. Males showed an isometric growth pattern (I) for head height and an accelerated (+A) or retarded (-A) growth pattern for the pre-orbital and post-orbital distance, respectively. However, females showed a retarded (-A) growth rate of the head height and an isometric growth pattern (I) for pre-orbital and post-orbital distances. Thus, the male red porgy appears to have a taller head compared to females. Additionally, the head in males is wider and the orbits are positioned more posteriorly in the head. The adaptive significance of these differences remains currently unclear but should be studied in relation to protogynous hermaphroditism and the specific features of male biology in the red porgy.

Pagrus; porgy; morphometry; allometry; sexual dimorphism
BJZ

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Editor-in-Chief:
Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium

 



1863-1903
Annales de la Société malacologique de Belgique
 
1903-1923
​Annales de la Société royale malacologique et zoologique de Belgique
 
1923-1989
Annales de la Société Royale Zoologique de Belgique
 
1989-
Belgian Journal of Zoology